package se7en.smarthome;

import android.content.Context;  
import android.graphics.Camera;  
import android.graphics.Matrix;  
import android.util.AttributeSet;  
import android.view.View;  
import android.view.animation.Transformation;  
import android.widget.Gallery;  
import android.widget.ImageView;  
public class CoverFlow extends Gallery {  
      
    private Camera mCamera = new Camera();  
    private int mMaxRotationAngle = 50;  
    private int mMaxZoom = -380;  
    private int mCoveflowCenter;  
    private boolean mAlphaMode = true;  
    private boolean mCircleMode = false;  
    public CoverFlow(Context context) {  
        super(context);  
        this.setStaticTransformationsEnabled(true);  
    }  
    public CoverFlow(Context context, AttributeSet attrs) {  
        super(context, attrs);  
        this.setStaticTransformationsEnabled(true);  
    }  
    public CoverFlow(Context context, AttributeSet attrs, int defStyle) {  
        super(context, attrs, defStyle);  
        this.setStaticTransformationsEnabled(true);  
    }  
    public int getMaxRotationAngle() {  
        return mMaxRotationAngle;  
    }  
    public void setMaxRotationAngle(int maxRotationAngle) {  
        mMaxRotationAngle = maxRotationAngle;  
    }  
    public boolean getCircleMode() {  
        return mCircleMode;  
    }  
    public void setCircleMode(boolean isCircle) {  
        mCircleMode = isCircle;  
    }  
    public boolean getAlphaMode() {  
        return mAlphaMode;  
    }  
    public void setAlphaMode(boolean isAlpha) {  
        mAlphaMode = isAlpha;  
    }  
    public int getMaxZoom() {  
        return mMaxZoom;  
    }  
    public void setMaxZoom(int maxZoom) {  
        mMaxZoom = maxZoom;  
    }  
    private int getCenterOfCoverflow() {  
        return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2  
                + getPaddingLeft();  
    }  
    private static int getCenterOfView(View view) {  
        return view.getLeft() + view.getWidth() / 2;  
    }  
    protected boolean getChildStaticTransformation(View child, Transformation t) {  
        final int childCenter = getCenterOfView(child);  
        final int childWidth = child.getWidth();  
        int rotationAngle = 0;  
        t.clear();  
        t.setTransformationType(Transformation.TYPE_MATRIX);  
        if (childCenter == mCoveflowCenter) {  
            transformImageBitmap((ImageView) child, t, 0);  
        } else {  
            rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);  
            if (Math.abs(rotationAngle) > mMaxRotationAngle) {  
                rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle  
                        : mMaxRotationAngle;  
            }  
            transformImageBitmap((ImageView) child, t, rotationAngle);  
        }  
        return true;  
    }  
    /** 
     * This is called during layout when the size of this view has changed. If 
     * you were just added to the view hierarchy, you're called with the old 
     * values of 0. 
     *  
     * @param w 
     *            Current width of this view. 
     * @param h 
     *            Current height of this view. 
     * @param oldw 
     *            Old width of this view. 
     * @param oldh 
     *            Old height of this view. 
     */  
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {  
        mCoveflowCenter = getCenterOfCoverflow();  
        super.onSizeChanged(w, h, oldw, oldh);  
    }  
    /** 
     * Transform the Image Bitmap by the Angle passed 
     *  
     * @param imageView 
     *            ImageView the ImageView whose bitmap we want to rotate 
     * @param t 
     *            transformation 
     * @param rotationAngle 
     *            the Angle by which to rotate the Bitmap 
     */  
    private void transformImageBitmap(ImageView child, Transformation t,  
            int rotationAngle) {  
        mCamera.save();  
        final Matrix imageMatrix = t.getMatrix();  
        final int imageHeight = child.getLayoutParams().height;  
        final int imageWidth = child.getLayoutParams().width;  
        final int rotation = Math.abs(rotationAngle);  
        mCamera.translate(0.0f, 0.0f, 100.0f);  
        // As the angle of the view gets less, zoom in  
        if (rotation <= mMaxRotationAngle) {  
            float zoomAmount = (float) (mMaxZoom + (rotation * 1.5));  
            mCamera.translate(0.0f, 0.0f, zoomAmount);  
            if (mCircleMode) {  
                if (rotation < 40)  
                    mCamera.translate(0.0f, 155, 0.0f);  
                else  
                    mCamera.translate(0.0f, (255 - rotation * 2.5f), 0.0f);  
            }  
            if (mAlphaMode) {  
                ((ImageView) (child)).setAlpha((int) (255 - rotation * 2.5));  
            }  
        }  
        mCamera.rotateY(rotationAngle);  
        mCamera.getMatrix(imageMatrix);  
        imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));  
        imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));  
        mCamera.restore();  
    }  
}  